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x in (-oo:+oo)
(-4/7)*x+1 = 7 // - 7
(-4/7)*x-7+1 = 0
-4/7*x-6 = 0 // + 6
-4/7*x = 6 // : -4/7
x = 6/(-4/7)
x = -21/2
x = -21/2
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